1,索引：
exec dbms_stats.gather_table_stats(ownname=>'etl',tabname=>'f_p10ids_classcode_l');
analyze index index1 validate structure：
analyze index index1 compute statistics：
2, 謂詞上移 & 謂詞下推 predicate push
e, cbo hint:no_unnest,push_subq,push_pred的用法 http://www.itpub.net/viewthread.php?tid=1308385
3, table join :
key: semi
4,分析函式:
select address
,disk_reads
,executions
,100 * ratio_to_report(disk_reads) over() pct
from sys.v_$sql
where command_type != 47
order by disk_reads desc ;
5 ,使用如下語句，查出此時，系統消耗多的sql
-- etl
drop table temp_v$sql ;
create table temp_v$sql (
sql_id varchar2(30),
sql_text varchar2(1000),
executions varchar2(30),
parse_calls varchar2(30),
disk_reads varchar2(30),
buffer_gets varchar2(30),
user_io_wait_time varchar2(30),
rows_processed varchar2(30),
cpu_time varchar2(30),
elapsed_time varchar2(30),
type varchar2(30),
dttm date
) ;-- ccframe
delete from etl.temp_v$sql ;
commit;
insert into etl.temp_v$sql
select sql_id
,max(sql_text) sql_text
,sum(executions) executions
,sum(parse_calls) parse_calls
,sum(disk_reads) disk_reads
,sum(buffer_gets) buffer_gets
,sum(user_io_wait_time) user_io_wait_time
,sum(rows_processed) rows_processed
,sum(cpu_time) cpu_time
,sum(elapsed_time) elapsed_time
,'before'
,sysdate
from sys.v_$sql
where command_type != 47
commit;
insert into etl.temp_v$sql
select sql_id
,max(sql_text) sql_text
,sum(executions) executions
,sum(parse_calls) parse_calls
,sum(disk_reads) disk_reads
,sum(buffer_gets) buffer_gets
,sum(user_io_wait_time) user_io_wait_time
,sum(rows_processed) rows_processed
,sum(cpu_time) cpu_time
,sum(elapsed_time) elapsed_time
,'after'
,sysdate
from sys.v_$sql
where command_type != 47
commit;
select *
from (select bef.sql_id
,bef.sql_text
,aft.executions - bef.executions executions
,trunc((100 * ratio_to_report(aft.executions - bef.executions) over()),2) pct_executions
,aft.parse_calls - bef.parse_calls parse_calls
,trunc((100 * ratio_to_report(aft.parse_calls - bef.parse_calls) over()),2) pct_parse_calls
,aft.disk_reads - bef.disk_reads disk_reads
,trunc((100 * ratio_to_report(aft.disk_reads - bef.disk_reads) over()),2) pct_disk_reads
,aft.buffer_gets - bef.buffer_gets buffer_gets
,trunc((100 * ratio_to_report(aft.buffer_gets - bef.buffer_gets) over()),2) pct_buffer_gets
,aft.user_io_wait_time - bef.user_io_wait_time user_io_wait_time
,trunc((100 * ratio_to_report(aft.user_io_wait_time - bef.user_io_wait_time) over()),2) pct_io_wait_time
,aft.rows_processed - bef.rows_processed rows_processed
,trunc((100 * ratio_to_report(aft.rows_processed - bef.rows_processed) over()),2) pct_rows_processed
,aft.cpu_time - bef.cpu_time cpu_time
,trunc((100 * ratio_to_report(aft.cpu_time - bef.cpu_time) over()),2) pct_cpu_time
,aft.elapsed_time - bef.elapsed_time elapsed_time
,trunc((100 * ratio_to_report(aft.elapsed_time - bef.elapsed_time) over()),2) pct_elapsed_time
from etl.temp_v$sql bef, etl.temp_v$sql aft
where bef.sql_id = aft.sql_id
and bef.type = 'before'
and aft.type = 'after') tt
order by elapsed_time desc; --sql ordered by elapsed time
order by cpu_time desc; --sql ordered by cpu time
order by buffer_gets desc ;-- sql ordered by gets
order by disk_reads desc ; -- sql ordered by reads
order by executions desc ; -- sql ordered by executions
order by parse_calls desc; --sql ordered by parse calls
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